Added imagefilter() function by Pierre-Alain Joye (paj@pearfr.org). This

function allows negate, grayscale, brightness, contrast, colorize, selective blur,
Gaussian blur, edge detect, smooth, sharpen and emboss filters to be applied
on an image.

1 files changed, 36 insertions, 0 deletions

diff --git a/ext/gd/libgd/gd.h b/ext/gd/libgd/gd.h
index 21c3c5515b..4629cd9a59 100644
--- a/ext/gd/libgd/gd.h
+++ b/ext/gd/libgd/gd.h
@@ -517,6 +517,42 @@ void* gdDPExtractData(struct gdIOCtx* ctx, int *size);
 #define GD2_FMT_RAW             1
 #define GD2_FMT_COMPRESSED      2
 
+
+/* filters section 
+ *
+ * Negate the imag src, white becomes black,
+ * The red, green, and blue intensities of an image are negated.
+ * White becomes black, yellow becomes blue, etc.
+ */
+int gdImageNegate(gdImagePtr src);
+
+/* Convert the image src to a grayscale image */
+int gdImageGrayScale(gdImagePtr src);
+
+/* Set the brightness level <brightness> for the image src */
+int gdImageBrightness(gdImagePtr src, int brightness);
+
+/* Set the contrast level <contrast> for the image <src> */
+int gdImageContrast(gdImagePtr src, double contrast);
+
+/* Simply adds or substracts respectively red, green or blue to a pixel */
+int gdImageColor(gdImagePtr src, int red, int green, int blue);
+
+/* Image convolution by a 3x3 custom matrix */
+int gdImageConvolution(gdImagePtr src, float ft[3][3], float filter_div, float offset);
+
+int gdImageEdgeDetectQuick(gdImagePtr src);
+
+int gdImageGaussianBlur(gdImagePtr im);
+
+int gdImageSelectiveBlur( gdImagePtr src);
+
+int gdImageEmboss(gdImagePtr im);
+
+int gdImageMeanRemoval(gdImagePtr im);
+
+int gdImageSmooth(gdImagePtr im, float weight);
+
 /* Image comparison definitions */
 int gdImageCompare(gdImagePtr im1, gdImagePtr im2);